MAHLE 51475CP.020 Standard Piston Ring Set 0.020 Over

The MAHLE 51475CP.020 is a standard replacement piston ring set in a 0.020-inch oversize specification, engineered to OE form, fit, and function. MAHLE is one of the world's largest OE piston ring manufacturers, and this set carries the same technology and precision found in original equipment applications.

Key Features:

• OE-Quality Upper Compression Ring: Cast iron or ductile cast iron construction with a positive twist and barrel face for fast, reliable break-in
• CP-20 Oil Ring Assembly: Features an exclusive 20-degree ear angle for maximum side seal against the cylinder wall, plus a chemically polished expander for enhanced oil drain-back
• Superior Oil Control: Second ring design provides improved combustion gas management, top ring stability, and reduced oil consumption
• High Tensile & Yield Strength: Low ring mass combined with excellent hardness delivers stress resistance and minimal groove pound-out
• Long Service Life: Engineered for excellent cylinder conformability, low friction, and effective blow-by control
• 0.020-Inch Oversize: Designed for cylinders bored 0.020 inches over standard to restore proper sealing after engine reconditioning

MAHLE Original piston ring sets — formerly marketed under the Perfect Circle brand — have been trusted by professional engine builders and automotive technicians for over 100 years. This set is the correct choice when rebuilding or overhauling an engine that has been bored to 0.020-inch oversize, ensuring a proper combustion seal, optimized oil control, and restored engine performance.